Defensive publication

ABSTRACT

A METHOD FOR THE PREPARATION OF A FACED SPONGE RUBBER CARPET UNDERLAYMENT COMPRISING FORMING A FOAMABLE AND CURABLE RUBBER LAYER, HEATING THE RUBBER, LAYING A BONDED NONWOVEN SHEET OF SYNTHETIC ORGANIC FIBERS FLAT ATOP THE HOT LAYER OF RUBBER AT A TEMPERATURE IN THE RANGE OF ABOUT 90 AND 150*C, BUT BELOW THAT OR EQUAL TO THE TEMPERATURE AT WHICH THE FABRIC EXHIBITS MAXIMUM SHRINKAGE, AND THEN HEATING THE COMBINATION TO A TEMPERATURE IN THE RANGE OF ABOUT 170 TO 190*C, TO EFFECT FOAMING AND CURING OF THE RUBBER AS WELL AS ADHESTION OF THE RUBBER TO THE FABRIC, THE SAID FABRIC HAVING A NET IRREVERSIBLE THERMAL SHRINKAGE IN THE LENGTHWISE AND WIDTHWISE DIRECTIONS OF BETWEEN ABOUT 1.2 AND 5% WHEN HEATED TO ABOUT 170*C, AND SUBSEQUENTLY COOLED.

EFENSTVE PULTC TIN UNITED STATES PATENT OFFICE Published at the requestof the applicant or owner in accordance with the Notice of Dec. 16,1969, 869 0.6. 687. The abstracts of Defensive Publication applicationsare identified. by distinctly numbered series and are arrangedchronologically. The heading of each abstract indicates the number ofpages of specification, including claims and sheets of drawingscontained in the application as originally filed. The files of theseapplications are-available to the public-for inspection and reproductionmay be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Pgitent Oiiice makes no assertion as tothe novelty of the disclosed subject matter;

PUBLISHED AUG. 1, 1972 PROCESS FOR FACING A SPONGE RUBBER CAR- PETUNDERLAYMENT WHTH A NONWOVEN FIBROUS SHEET Brian R. Phillips and RichardD. Hutchins, Wilmington,

Del., assignors to E. I. du Pont de Nemours and Company, Wilmington,Del.

Original application Feb. 28, 1969, Ser. No. 803,425, now Patent No.3,575,784, dated Apr. 20, 1971. Divided and this application Dec. 9,1970, Ser. No. 96,635

Int. Cl. 1332b /18 US. Cl. 156-79 No Drawing. 16 Pages Specification Amethod for the preparation of a faced sponge rubber carpet underlaymentcomprising forming a foamable and curable rubber layer, heating therubber, laying a bonded nonwoven sheet of synthetic organic fibers fiatatop the hot layer of rubber at a temperature in the range of about andC. but below that or equal to the temperature at which the fabricexhibits maximum shrinkage, and then heating the combination to atemperature in the range of about to C. to effect foaming and curing ofthe rubber as well as adhesion of the rubber to the fabric, the saidfabric having a net irreversible thermal shrinkage in the lengthwise andWidthwise directions of between about 1.2 and 5% when heated to about170 C. and subsequently cooled.

